drm/nv50: fix regression that break LVDS in some places

A previous commit started additionally using the SOR link when trying to
match the correct output script.  However, we never fill in this field
for LVDS so we can never match a script at all.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_bios.c

@@ -5627,6 +5627,7 @@ parse_dcb20_entry(struct drm_device *dev, struct dcb_table *dcb,
 				entry->lvdsconf.use_acpi_for_edid = true;
 			if (conf & 0x4)
 				entry->lvdsconf.use_power_scripts = true;
+			entry->lvdsconf.sor.link = (conf & 0x00000030) >> 4;
 		}
 		if (conf & mask) {
 			/*